chloride analyser

8/13/2019 Chloride Analyser

1/48Siemens PA 01 2013

2/2 Introduction

2/2 Introduction to TDLS:LDS 6 and SITRANS SL

2/3 LDS 62/3 General information

2/10 19" central unit

2/20 Cross-duct sensor CD 6

2/30 Documentation

2/30 Suggestions for spare parts

2/31 SITRANS SL

2/31 In-situ O2and CO gas analyzer

2/48 Documentation

Continuous Gas Analyzers,in-situ

Siemens AG 2013


2/48

Continuous Gas Analyzers, in-situIntroduction

Introduction to TDLS: LDS 6 and SITRANS SL

2/2 Siemens PA 01 2013

Overview

In-situ process gas analysis

Process gas analyzers are used for continuous determination ofthe concentrations of one or more gases in a gas mixture. Deter-mination of the concentration of gases in a process is used to

control and monitor process flows, and is therefore decisive forthe automation and optimization of processes and ensuringproduct quality. In addition, process gas analyzers are used tocheck emissions, thus making an important contribution toenvironmental protection, as well as for ensuring compliancewith statutory directives.

In-situ analytical procedures feature physical measurements inthe flow of process gas directly in the actual process gas line. Incontrast to extractive gas analysis, a sample is not taken androuted on to the analyzer via a sample l ine and sample prepa-ration. Only in exceptional cases, the process conditions makeit necessary to condition the sample gas stream in a bypass linewith respect to process temperature, pressure and/or opticalpath length. Further conditioning of the process gas, such asdrying or dust precipitation, is unnecessary. The analyzercarrying out in-situ measurements must always take into accountchanging process conditions (if these occur) and be able toautomatically process them in the calibration model. Computedtemperature and pressure compensation is frequently requiredfor this. In addition, the analyzer must be extremely rugged sinceits sensors have direct contact with the process gas. The fastand non-contact measurement of gas concentrations directly inthe process is the domain of in-situ diode laser gas analyzers.

The gas analyzer LDS 6 combines the compact and service-friendly design, simple operation and network capability of theSeries 6 analyzers with the well-known exceptional performancedata of in-situ gas analysis - namely high ruggedness and avail-ability as well as low maintenance - by using diode lasertechnology and fiber-optics. Up to three CD 6 in-situ cross-ductsensors (which are also optionally available in an intrinsically-safe version for operation in hazardous areas) can be combinedwith an LDS 6 analyzer in the compact 19" rack unit enclosure.The distance between the analyzers control unit - typically in anexisting instrument room or the process plants control room -and the max. three measuring points can be up to 700 m in eachcase.

The SITRANS SL gas analyzer for highly sensitive measurementof oxygen and carbon monoxide has a more integrated designwithout fiber-optic cables and with only one pair of cross-ductssensors - a transmitter unit and a detector unit. In this case the

receiver has a local user interface (LUI) which is controlled usingIR remote control.

A maintenance-free reference gas cell integrated in bothanalyzers drastically reduces the need for recalibration(SITRANS SL) or even makes its superfluous (LDS 6). Remotescanning and diagnostics of the analyzers is possible using theEthernet interface present as standard.

The list of gas components measurable using NIR diode lasertechnology already comprises:

For the LDS 6 analyzer:O2, NH3, HCl, HF, H2O, CO, CO2, ...

For the SITRANS SL analyzer: O2, CO

The list is being permanently extended as laser technology isdeveloped further. The LDS 6 O2analyzers additionally allowsimultaneous non-contact determination of high process gastemperatures.

Gas measurements with diode lasers feature exceptional selec-tivity and flexibility. Neither high process temperatures nor highand varying concentrations of particles in the gas have aninfluence on the quality of the result within wide ranges. Forexample, it is possible with the LDS 6 to determine traceconcentrations of NH3, HCl or HF directly in moist process gaseseven before any gas purification stage.

These features together with fast measurements free of deadtimes mean that diode laser gas analysis with the LDS 6 or theSITRANS SL is an extremely interesting alternative to estab-lished extractive analyses.

Siemens AG 2013


3/48

Continuous Gas Analyzers, in-situLDS 6

General information


Overview

LDS 6 is a diode laser gas analyzer with a measuring principlebased on the specific light absorption of different gas compo-nents. LDS 6 is suitable for fast and non-contact measurementof gas concentrations or temperatures in process or flue gases.

One or two signals from up to three measuring points are pro-cessed simultaneously by the central analyzer unit. The in-situcross-duct sensors at each measuring point can be separatedup to 700 m from the central unit by using fiber-optic cables. Thesensors are designed for operation under harsh environmentalconditions and contain a minimum of electrical components.

LDS 6, typical installation with cross-duct sensors

Benefits

The in-situ gas analyzer LDS 6 is characterized by a high avail-ability and unique analytical selectivity, and is optimally suitablefor numerous applications. LDS 6 enables the measurement of

one or two gas components or - if desired - the gas temperaturedirectly in the process:

With high dust load

In hot, humid, corrosive, explosive, or toxic gases

In applications showing strong varying gas compositions

Under harsh environmental conditions at the measuring point

Highly selective, i.e. mostly without cross-sensitivities

LDS 6 properties:

Little installation effort

Minimum maintenance requirements

Extremely rugged design

High long-term stability through built-in, maintenance-freereference gas cell, field calibration is unnecessary

Real-time measurementsMoreover, the instrument provides warning and failuremessages upon:

Need for maintenance- Erroneous reference function- Bad signal quality

Violation of a lower or upper alarm level for the measuredvariable

Transmitted amount of light violating an upper or lower limit

Application

Applications

Process optimization

Continuous emission monitoring for all kinds of fuels(oil, gas, coal, and others)

Process measurements in power utilities and any kind ofincinerator

Process control

Explosion protection

Measurements in corrosive and toxic gases

Quality control

Environmental protection

Plant and operator safety

Sectors

Power plants

Steel works

Cement industry

Chemical and petrochemical plants Automotive industry

Waste incinerators

Glass and ceramics production

Research and development

Special applications

In addition to the standard applications, special applications areavailable upon request.

Siemens AG 2013


4/48


General information


Design

The gas analyzer LDS 6 consists of a central unit and up to threein-situ sensors. The connection between the central unit and thesensors is established by a so-called hybrid cable, which con-tains optical fibers and copper wires. An additional cable con-

nects the transmitter and receiver parts of the cross-duct sensor.Central unit

The central unit is housed in a 19" rack unit enclosure with4 holders for mounting:

In a hinged frame

In racks with or without telescopic rails

Display and control panel

Large LCD field for simultaneous display of measurementresult and device status

Contrast of the LCD field is adjustable via the menu

LED background illumination of the display withenergy-saving function

Easy-to-clean membrane touch pad with softkeys

Menu-driven operation for parameterization and diagnostics Operation support in plain text

Inputs and outputs

One to three measurement channels with hybrid connectionsfor the sensors at the measuring points

2 analog inputs per channel for process gas temperature and

pressure 2 analog outputs per channel for gas concentration(s) or for

gas temperature and concentration For selected versions, thetransmission can be read out as an alternative.

6 freely configurable binary inputs per channel for signalingfaults or maintenance requests from external temperature orpressure transducers or sensor purging failure.

6 freely configurable binary outputs per channel (signaling offault, maintenance requirements, function control, transmis-sion limit alarm, concentration limit alarm, store analog output)

Communication

Network connection: Ethernet (T-Base-10) for remote diagnos-tics and maintenance.

LDS 6 central unit, membrane keyboard and graphic display

Status line to indicate

the device status

LED-backlit graphic

display and membrane

tactile-touch keyboard

Two code levels

according to NAMUR

MEAS key

to return direct to

measurement mode

Menu-driven

operator control

with five softkeys

ESC key

to cancel entries

INFO key

for help in plain text

CLEAR key

to delete the

digits entered

Numeric keypadfor entering digits

Numeric display

of concentrations

ENTER key

to adopt

the numbers

Siemens AG 2013


5/48


General information


Cross-duct sensors

Sensor CD 6, transmitter or detector unit

In-situ cross-duct sensors, configured as transmitter anddetector unit, connected via sensor cable

Connection to the LDS 6 central unit via a so-called hybridcable of max. 700 meters in length (max. 250 m in Ex Zone 0and Ex Zone 1)

Stainless steel, some painted aluminum

IP65 degree of protection for sensor

Adjustable flanges with flange connection

DN 65/PN 6, ANSI 4"/150 lbs

Optional flameproof window flanges with dimensions:DN 65/PN 6, DN 80/PN 16, ANSI 4"/150 lbs, other processinterfaces available on request

Purging facilities on the process and the sensor sides,configurable application with purging gas connections for:- Instrument air- Purging air blower- Steam- Nitrogen- Process gases to which the pressure equipment directive

cat. 2 does not apply

In combination with high-pressure window flanges, purgingwith instrument air or nitrogen is possible

Fast connectors for cleaning the measurement openings andthe sensor window

Optional: Version with explosion protection in accordance withATEX / IEC Ex ia

Sensor type CD 6 is compliant with the pressure equipmentdirective

Parts in contact with the process gas

The sensors normally do not come into contact with the processgas, since purging with a gaseous media is applied at the pro-cess side. Stainless steel purging gas tubes in front of the sensorwindows immerse slightly into the process gas and thus limit thepurging volume. Special materials such as Hastelloy and plas-

tics (PP) are available on request.Hybrid and sensor cables

A combination of fiber-optic cables and twisted copper wiresconnects the sensors to the central unit. The hybrid cable con-nects the central unit with the detector unit of the sensor, the sen-sor cable connects the transmitter and receiver units of the sen-sor.

For installation in Ex-protected environments, the legislative reg-ulations have to be complied with, such as the spatial separationof intrinsically-safe from non-intrinsically-safe cables.

In compliance with standard EN IEC 60079-14, systems with in-trinsically-safe circuits must be installed such that their intrinsicsafety is not impaired by electric or magnetic fields. Thereforethe hybrid and sensor cables of the LDS 6 in an Ex application

must be routed in such a way that they cannot generate electricor magnetic fields, e.g. by coiling them in more than one cableloop. To guarantee a good signal quality and to avoid impermis-sible inductance loops, the hybrid and sensor cables should bekept as short as possible.

The distance between central unit and measuring point canbe- up to 250 m for Ex units when used in Zone 0 and Zone 1- up to 700 m for Ex units used in Zone 2 and for non-Ex units

Hybrid and sensor cables- Multimode fiber-optic cable, provided with SMA connections

for transmission of the measured signal- Two-wire copper cable, in twisted pair version, for +24 V

supply of the detector electronics (+12 V in the case of Ex-suitable instruments)

Additionally for the hybrid cable:

- Single-mode fiber-optic cable, configured double-sided withE2000 connectors for transmission of laser light

Rugged cable sheath for laying in open cable ducts or duct-works

Sheath material: oil-resistant polyurethane

Connections of the hybrid cable

Siemens AG 2013


6/48


General information


Function

Operating principle

LDS 6 is a gas analyzer employing single-line molecular absorp-tion spectroscopy. A diode laser emits a beam of near-infraredlight, which passes through the process gas and is detected by

a receiver unit. The wavelength of the laser diode output is tunedto a gas-specific absorption line. The laser continuously scansthis single absorption line with a very high spectral resolution.

The result is a fully resolved single molecular line which is ana-lyzed in terms of absorption strength and line shape. The influ-ence of cross-sensitivities on the measurement is negligible,

since the quasi-monochromatic laser light is absorbed very se-lectively by only one specific molecular line in the scannedspectral range.

Basic design of the LDS 6

Configuration examples

A feature of the in-situ analytical procedure is that the physicalmeasurement takes place directly in the stream of process gas,and usually also directly in the actual process gas line. All pro-cess parameters such as gas matrix, pressure, temperature,

moisture, dust load, flow velocity and mounting orientation caninfluence the measuring properties of the LDS 6 and must there-fore be systematically investigated for each new application.

A feature of the standard applications defined in the orderingdata of the LDS 6 is that the typical process conditions are well-known and documented, and that the guaranteed measuringproperties can be proven by reference installations. If you can-not find your application among the standard applications,please contact Siemens. We will be pleased to check your pos-sible individual application of the LDS 6. You can find an appli-cation questionnaire on the LDS 6 product sites on the Internet.

Typical transmitted light setup of LDS 6, in-situ

To avoid contamination of sensor optics on the process side,clean gaseous purging media such as instrument air, N2orsteam are used. Purging air tubes on the sensor heads, whichslightly penetrate into the process gas stream, define the effec-tive measuring path length.

P1

P0

PR

P2

P3

Measured

volume

E/O

Channel 1

Lasercontrol

Diode

laser

Optocoupler

Referencecell

CPU and

display

Signal

processing

Laser light

Electrical signals

Reflected LED light

Central unit Hybrid cables Measurement path

E/O

E/O

E/O

Measured

volume

Measuredvolume

Channel 2

Channel 3

E/O

E/O

Central unit

Hybrid cable

Supplementary channel (option)

Supplementary channel (option)

Transmitter unit Receiver

Process flange

Sensor connecting cable

Measurement

path length

Gas concentration

Flue gascomposition

SteamDust load

Gas velocityGas temperature

Gas pressure

Siemens AG 2013


7/48


General information


The LDS 6 can measure in both the transverse and longitudinaldirections of the process gas flow. In certain cases, the processconditions make it necessary to condition the sample gasstream in a bypass line with respect to process temperature,pressure and/or optical path length. Further treatment of the pro-cess gas, such as drying or dust precipitation, is usually unnec-essary.

Typical transmitted light setup of LDS 6, in bypass

A flow cell is available by special application for the LDS 6 whichhas been specially optimized for use with the LDS 6 and itstransmitted-light sensors with respect to handling and measur-ing performance. It is designed to reduce surface effects, and istherefore also highly suitable for polar gases like ammonia. Thisflow cell is available in heated and non-heated versions. Wheelmounted and wall mounted versions are available.

Measuring configuration of LDS 6 with heated flow cell

General information

LDS 6 is connected to the measuring points by fiber optics. Thelaser light is guided by a single-mode fiber from the central unitto the transmitter unit of the in-situ sensor. The sensor consists ofa transmitter and a receiver; the distance between them definesthe measurement path. In the receiver box, the light is focusedonto a suitable detector. The detector signal is then converted

into an optical signal and transmitted via a second optical fiberto the central unit, where the concentration of the gas compo-nent is determined from the detected absorption signal.

LDS 6 usually measures a single gas component by means ofthe absorption capacity of a single fully resolved molecular ab-sorption line. The absorption results from conversion of the radi-ation energy of the laser light into the internal energy of the mol-ecule. In the working range of the LDS 6, both rotation-vibrationtransitions and electronic transitions - such as with O2- can betriggered.

In some specific cases, two components can be measured si-multaneously if their absorption lines are so close to each otherthat they can be detected within the laser spectrum by one sin-gle scan (for example water (H2O) and ammonia (NH3)).

Absorption spectra of water and ammonia

Typical measurable gases for LDS 6 are:

Oxygen (O2) for low and high pressure

Hydrogen fluoride (HF) + water

Hydrogen chloride (HCl) + water

Ammonia (NH3) + water

Water vapor (H2O)

Carbon monoxide (CO)

Carbon dioxide (CO2)

CO + CO2

By using an internal reference cell normally filled with the gasmeasured, the stability of the spectrometer is permanently

checked in a reference channel.By doing so, the continuous validity of the calibration is ensuredwithout the need to carry out external recalibration using bottledcalibration gases or reference gas cells.

Typical spectral bandwidth of an absorption line compared to the band-width of the laser light.

Transmitter unit

Central unit

Receiver

Sample gas

outlet

Samplegasinlet

Temperature

sensorHybrid cable

Supplementarychannel (option)


Sensorconnectingcable

Transmitter unit

Central unit

Receiver

Sam

plegas

inlet

PumpHybrid cable



Sensorconnec

tingca

ble Heating

(option)

Siemens AG 2013


8/48


General information


Influences on the measurement

Dust load

As long as the laser beam is able to generate a suitable detectorsignal, the dust load of the process gases does not influence theanalytical result. By applying a dynamic background correction,measurements can be carried out without any negative impact.Under good conditions, particle densities up to 100 g/Nm3canbe handled by the LDS 6. Varying dust loads are compensatedby scanning the laser over the gas absorption line and the cur-rent background. At a scan position next to the absorption line,the instrument can "see" only absorption caused by the dust loadwhere at the line center the signal is composed of the molecularabsorption and the continuous, unspecific background absorp-tion. With the wavelength modulation technique, the actual mea-sured transmission is always compared with the baseline. Aftersignal processing, phase-sensitive application delivers a signalonly from the molecular line free of background.The influence of a high dust load is complex and depends on thepath length and particle size. The optical damping increases atlonger path lengths. Smaller particles also have a large influenceon the optical damping. With a combination of high dust load,long path length and small particle size, the technical support at

Siemens should be consulted.Temperature

The temperature influence on the absorption line strength iscompensated by a correction factor determined during calibra-tion. A temperature signal can be fed into the instrument from anexternal temperature sensor. This signal is then used to correctthe influence of the temperature on the observed line strength.If the temperature of the sample gas remains constant, it is alter-natively possible to carry out a static correction using a presetvalue.At high process gas temperatures, generally from approximately1 000 C, there may be noticeable broadband IR radiation of gasand dust, or flames may occasionally occur in the measurementpath. An additional optical bandpass filter can be set upstreamof the detector to protect it and prevent saturation by the strongbackground radiation.

Pressure

The gas pressure can affect the line shape of the molecular ab-sorption line. LDS 6 uses a special algorithm to adapt the lineshape. Additionally, an external pressure signal can be fed to theinstrument to provide complete compensation for the pressureinfluence including the density effect.

Cross-interferences

Since LDS 6 derives its signal from a single fully resolved molec-ular absorption line, cross-interferences with other gases arequite unlikely. LDS 6 is therefore able to measure the desired gascomponents very selectively. In special cases, the compositionof the process gas might have an influence on the shape of theabsorption line features. This influence is compensated by ana-lyzing the full shape of the detected signal curve applying spe-

cific algorithms.Optical path length

The absorption values analyzed by the LDS 6 are typically small.As a result of Beer-Lamberts law, the absorption of laser light de-pends on the optical path length within the gas. Therefore, theprecision in determining the effective optical path length in theprocess might limit the overall precision of the measurement.As the sensor optics on the process side normally need to bepurged to keep them clean over a long period of time, the thick-ness of the mixing zone between the purging medium and theprocess gas and its concentration distribution need to be con-sidered. In a typical in-situ installation directly in the line and withsome meters of path, the influence of the purging gas on the ef-fective path length can be neglected.Path length and dust load are mutually influencing: the higher

the dust load in the process, the shorter the max. possible pathlength.

Maintenance and fault messages

LDS 6 outputs different warnings via relays:

Need for maintenance (measured value is not influenced)

Operating error (measured value might be influenced)

Note

Individual requirements for the measuring point can make theutilization of special sensor equipment necessary. The possibili-ties for adapting the sensors are:

Different purging media, such as instrument air, ambient air,nitrogen or steam

Different purging modes on process and sensor sides

Special materials of purging tubes and/or sensor flanges

Cooling or heating of the sensors

Explosion-protected sensor configurations

Essential characteristics

Integrated calibration adjustment with an internal referencecell

Negligible long-term drifts of zero and span

Dynamic background correction for varying dust loads Isolated signal outputs, 4 to 20 mA

User-friendly, menu-driven operation

Selectable time constants (response time)

Two user levels with individual access codes for prevention ofunwanted and unauthorized operations

Operation according to NAMUR recommendations

Monitoring of overall optical transmission

Remote preventive maintenance and servicing viaEthernet/modem

Straightforward replacement of the central unit, since connec-tions can easily be removed

Sensor and central unit housing free of wear and corrosion

Easy operation with a numerical keypad and menu prompting

Certified versions for emission monitoring

The LDS 6 is available as certified instrument for emission mon-itoring of NH3, NH3/H2O, H2O, HCl, HCl/H2O. The certificatesare issued by TV for Germany and MCERTS for the UnitedKingdom. For conducting regular calibration and linearitychecks, test kits for ammonia, water and HCl should be used.These kits can be ordered separately as instrument accessories.For new analyzer orders, the NH3, NH3/H2O and H2O kits named"Version 2" must be ordered. For already installed analyzers,please contact Siemens for spotting the correct kit version, orconsult the instrument manual.

Siemens AG 2013


9/48


General information


Verification of calibration

Assembly with certified, maintenance-free calibration gas cellwith connections for laser fiber-optic conductors and detectormodule of cross-duct sensor. Serves to rapidly verify the factorycalibration in the field without compressed gas bottles and flowcell.

Calibration verification kits are available for the following samplegases: O2(application codes AA, AC, AD), NH3, CO, CO2,CO/CO2. A "Zero gas test kit" is also available. (see "Additionalunits")

Example of an assembly for verification of calibration

Siemens AG 2013


10/48


19" central unit

2/10 Siemens PA 01 2013

Technical specifications

Analytical performance

Measuring range Adjustable

Detection limit (DL):

Calculated in accordance withVDI 2449, measured on every sup-plied analyzer during the tempera-ture test (between 5 ... 45 C) inaccordance with VDI 4203.

Depending on sample gas com-ponent: see table for standardapplications.For Code ET and FT: in accor-dance with the requirements of17th and 27th BImSchV

Smallest recommended measuringrange (with 1 m path length)

Depending on sample gas com-ponent: see table for standardapplications.

The maximum applicable measuring ranges can be found in the tableof standard combinations. These can only be applied if the individualprocess conditions allow it. Please contact the Technical Support fromSiemens for checking the applicability.

Accuracy 2 % / 5 %, depending on samplegas component and applicationletter. At best: detection limit. Seetable for standard applications.

For Code ET and FT: in accor-dance with the requirements of17th and 27th BImSchV

Linearity Better than 1 %

Repeatability 2 % of the measured value orminimum detection limit (which-ever is largest)

For Code ET and FT: in accor-dance with the requirements of17th and 27th BImSchV

Calibration interval No recalibration required thanksto internal reference cell

General information

Concentration units ppmv, Vol%, mg/Nm3

Display Digital concentration display

(5 digits with floating decimalpoint)

Laser protection class Class 1, safe to the eye

Certificates CE marking, TV, MCERTS

Design, enclosure

Degree of protection IP20 according to EN 60529

Dimensions 177 x 440 x 380 mm

Weight Approx. 13 kg

Mounting Horizontal

Electrical characteristics

Power supply 100 ... 240 V AC 50 ... 60 Hz,automatically adapted by the sys-tem; with a 3-channel central unit,an additional external power sup-ply +24 V DC, 50 VA is includedin the scope of delivery

Power consumption 50 W

EMC According to EN 61326 and stan-dard classification of NAMURNE21

Electrical safety According to EN 61010-1,overvoltage classification II

Fuse specifications 100 ... 240 V: T2.5L250V

Dynamic response

Warm-up time at 20 C ambienttemperature

Approx. 15 min

Response time Min. of 1 s, depending on appli-cation

Integration time 1 100 s, adjustable

Influencing variables

Ambient temperature < 0.5 %/10 K of the measuredvalue

Atmospheric pressure Negligible

Process gas pressure compensa-tion

Recommended

Process gas pressure range See table for standard applica-tions

Power supply changes < 1 %/30 V

Electrical inputs and outputs

Number of measurement channels 1 3, optional

Analog output 2 per channel, 4 ... 20 mA, float-

ing, ohmic resistance max. 750 Analog inputs 2 per channel,

designed for 4 ... 20 mA, 50

Binary outputs 6 per channel, with changeovercontacts, configurable, 24 VAC/DC/1 A, floating

Binary inputs 6 per channel, designed for 24 V,floating, configurable

Communication interface Ethernet 10BaseT (RJ-45)

Climatic conditions

Temperature range 5 45 C during operation,-40 +70 C during storageand transportation

Atmospheric pressure 800 1 200 hPa

Humidity < 85 % relative humidity,above dew point(in operation and storage)

Siemens AG 2013


11/48


19" central unit


Selection and ordering data Order No.

LDS 6 in-situ gas analyzer19" rack unit for installation in cabinets

7MB6121- 777 0 7 - 0 777

Explosion protectionWithout, not suitable for connection to Ex sensors 0Without, suitable for connection to Ex sensors in accordancewith ATEX II 1 G Ex ia IIC T4, ATEX II 1D Ex iaD 20 IP65 T135 C

1

Measured component Possible with application letterof the respective channel

O2 B, C, P A

NH3 A, E, F, T CNH3/H2O A, E, F, T D

HCl A, H, T EHCl/H2O A, H, T F

HF A, H GHF/H2O A, H H

CO C JCO/CO2 D K

CO2 A LH2O A, T M

Application letter ofmeasured component channel 1

Application examples channel 11)

A Emission monitoring, non-certified AB Emission monitoring, combustion

optimizationB

C Safety monitoring with appropriateplant concept

C

D Process control D

E SNCR-DeNOx EF SCR-DeNOx F

H Filter optimization HP Process control (high pressure) P

T Emission monitoring, certified according to17th BImSchV and MCerts, in combinationwith measured component variants C, D, E,F, M

T

CD 6, sensor alignment kitWith 0Without 1



X Channel 2 not used XA Emission monitoring AB Combustion optimization B


C

D Process control D




T

1) The examples shown represent possible applications where appropriately configured LDS 6 solutions can be used. The user is responsible for the prevailingconditions (plant concept (possibly redundant), application of appropriate components required in addition, compliance with possible directives, etc.).

Siemens AG 2013


12/48


19" central unit

2/12 Siemens PA 01 2013

1) The examples shown represent possible applications where appropriately configured LDS 6 solutions can be used. The user is responsible for the prevailingconditions (plant concept (possibly redundant), application of appropriate components required in addition, compliance with possible directives, etc.).



External 24 V DC power supplyincluded in scope of delivery

X Channel 3 not used XA Emission monitoring AB Combustion optimization B


C

D Process control D




T

Language (supplied documentation, software)

German 0English 1French 2Spanish 3Italian 4


LDS 6 in-situ gas analyzer19" rack unit for installation in cabinets

7MB6121- 777 0 7 - 0 777

Selection and ordering data

Additional versions Order code

Add "-Z" to Order No. and specify order code

Telescopic rails (2 units) A31

Set of Torx tools A32

TAG labels (customized inscription) Y30

Additional units Order No.

Optical band-pass filter for suppressing IR background radiation (flame filter) A5E00534668

External power supply for hybrid cable length > 500 m A5E00854188Calibration verification kit for NH3(version 2) A5E01075594

TV/MCERT linearity verification kit NH3(version 2), 2 cells A5E00823339013

TV/MCERT linearity verification kit NH3/H2O (version 2), 3 cells A5E00823339014

TV/MCERT linearity verification kit H2O (version 2), 2 cells A5E00823339015

Calibration verification kit for NH3(version 1) A5E00534675

TV/MCERT linearity verification kit NH3 (version 1), 2 cells A5E00823339003

TV/MCERT linearity verification kit NH3/H2O (version 1), 3 cells A5E00823339004

TV/MCERT linearity verification kit H2O (version 1), 2 cells A5E00823339005

TV/MCERT linearity verification kit HCl, 2 cells A5E00823339008

TV/MCERT linearity verification kit HCl/H2O, 3 cells A5E00823339009

TV/MCERT linearity verification kit H2O (only for HCl/H2O analyzers), 5 cells A5E00823339007

TV/MCERT linearity verification kit H2O (only for NH3/H2O analyzers), version 1,5 cells

A5E00823339002

TV/MCERT linearity verification kit H2O (only for NH

3/H

2O analyzers), version 2,

5 cellsA5E00823339012

TV/MCERT linearity verification kit HCl, 5 cells A5E00823339006

TV/MCERT linearity verification kit NH3, version 1, 5 cells A5E00823339001

TV/MCERT linearity verification kit NH3, version 2, 5 cells A5E00823339011

Linearity verification kit NH3(version 2), 10 cells A5E03693426

Calibration verification kit for O2(only for application codes AA, AC and AD) A5E01143755001

Calibration verification kit for CO A5E01143755003

Calibration verification kit for CO2 A5E01143755004

Calibration verification kit for CO/CO2 A5E01143755006

Zero gas verification kit for all gases except O2 A5E00823386009

Siemens AG 2013


13/48


19" central unit


Dimensional drawings

LDS 6, 19" central unit, dimensions in mm

s

LDS 6

428

440

465

483

178

355

432

483

437

177

351.5

101.6

Siemens AG 2013


14/48


19" central unit

2/14 Siemens PA 01 2013

Schematics

Pin assignments

LDS 6, 19" central unit, pin assignments

)

Siemens AG 2013


15/48


19" central unit


Optical and electrical connections

LDS 6, three-channel 19" central unit, optical and electrical connections

Power supplyand fuses

25-pin connector:

Binary inputs and

relay outputs

15-pin connector:

Binary inputs and

analog inputs/outputs

Hybrid cablesupport

E2000single mode

opto-connector

SMAmultimode

opto-connector

Ethernet

converter

RJ-45

24 V DCsensor

supply

Siemens AG 2013


16/48


19" central unit

2/16 Siemens PA 01 2013

More information

The following table lists the measuring conditions for standardapplications. The listed values for the measuring range and de-tection limit (DL) are only approximate values. The exact valuesat the respective measuring point depend on the totality of all in-

fluencing variables and can be determined by Siemens for thespecific case. Please note that the values for the detection limit

and the maximum measuring range refer to a path length of 1 m.Longer path lengths will improve the detection l imit, but not lin-early. due to limiting effects such as dust load. The maximum ap-plicable measuring ranges can only be used if permitted by the

process conditions such as dust load.

Footnotes: See page 2/18.

Standard application

Effective optical pathlength: 0.3 12 m

Dust load3):< 50 g/Nm3

Process gastemperature

Tmin Tmax

Process gaspressurepmin pmax

Min.measuringrange

(with 1 meff. opt. pathlength)

Max. measuringrange

(also depen-dent on eff. opt.path length:see followingcolumn)

(Max. measur-ing range xpath length)

(DL x pathlength)under stan-dard con-ditions1) 2)

withoutcross-inter-ference ofother gases

(DL x pathlength)At1 013 hPawith cross-interferenceof gas 2

Accu-racy4)

Gas1

Gas2

Gascode

Appl.code

Gas 1 Gas 1 Gas 1 Gas 1 Gas 1 Gas 1

O2 A B 600 1 200 C 950 1 050 hPa 0 15 vol% 0 100 vol% 240 vol%*m 0.3 vol%*mAt 600 C

5 %

C 0 600 C 950 1 050 hPa 0 5 vol% 0 100 vol% 75 vol%*m 0.1 vol%*m 2 %5)

P 0 200 C 950 5 000 hPa 0 5 vol% 0 100 vol% 75 vol%*m 0.1 vol%*m 2 %NH3 C A 0 150 C 950 1 050 hPa 0 25 ppmv 0 500 ppmv 2 500 ppmv*m 0.5 ppmv*m 0.9 ppmv*m

At 15 vol%H2O, 55 C

2 %

T 0 150 C 950 1 050 hPa 0 25 ppmv 0 500 ppmv 2 500 ppmv*m 0.5 ppmv*m 0.9 ppmv*mAt 15 vol%H2O, 55 C

2 %

E 250 350 C 950 1 050 hPa 0 45 ppmv 0 500 ppmv 2 500 ppmv*m 0.9 ppmv*mAt 250 C

1.4 ppmv*mat 15 Vol%H2O, 250 C

2 %

F 300 400 C 950 1 050 hPa 0 50 ppmv 0 500 ppmv 2 500 ppmv*m 1 ppmv*mAt 300 C

1.5 ppmv*mat 15 Vol%H2O, 300 C

2 %

NH3 H2O D A 0 150 C 950 1 050 hPa 0 25 ppmv 0 100 ppmv 1 200 ppmv*m 0.5 ppmv*m 0.9 ppmv*mAt 15 vol%H2O, 55 C

2 %

T 0 150 C 950 1 050 hPa 0 25 ppmv 0 100 ppmv 1 200 ppmv*m 0.5 ppmv*m 0.9 ppmv*mAt 15 vol%H2O, 55 C

2 %

E 250 350 C 950 1 050 h Pa 0 45 p pmv 0 100 p pmv 1 2 00 ppmv*m 0.9 ppmv*mAt 250 C

1.4 ppmv*mAt 15 vol%H2O, 250 C

2 %

F 300 400 C 950 1 050 h Pa 0 50 p pmv 0 100 p pmv 1 2 00 ppmv*m 1 ppmv*mAt 300 C


2 %

HCl E A 0 150 C 950 1 050 hPa 0 30 ppmv 0 6 000 ppmv 1 200 ppmv*m 0.6 ppmv*m 2.2 ppmv*mAt 15%H2O, 55 C

5 %

T 120 210 C 950 1 050 hPa 0 10 ppmv 0 60 ppmv 720 ppmv*m

H 150 250 C 950 1 050 hPa 0 50 ppmv 0 6 000 ppmv 1 200 ppmv*m 1.0 ppmv*mAt 150 C

3.1 ppmv*mat 15 Vol%

H2O, 150 C

5 %

HCl H2O F A 0 150 C 950 1 050 hPa 0 30 ppmv 0 100 ppmv 1 200 ppmv*m 0.6 ppmv*m 2.2 ppmv*mAt 15%H2O, 55 C

5 %

T 120 210 C 950 1 050 hPa 0 10 ppmv 0 60 ppmv 720 ppmv*m

H 150 250 C 950 1 050 h Pa 0 50 p pmv 0 100 p pmv 1 2 00 ppmv*m 1.0 ppmv*mAt 150 C


5 %

Siemens AG 2013


17/48


19" central unit


Footnotes: See page 2/19.



Dust load3): < 50 g/Nm3

Min. measuringrange

(with 1 m eff. opt.path length)

Max. mea-suring range

(usually alsodependent oneff. opt. pathlength: seefollowingcolumn)

(Max.measuringrange xpathlength)

(DL x pathlength)understandardconditions1) 2)

(DL x pathlength)At 1 013 hPawith cross-interferenceof gas 1

Accu-racy4)

Purging gasmode

Purginggasmedium

Gas 1 Gas 2 Gascode

Appl.code

Gas 2 Gas 2 Gas 2 Gas 2 Gas 2 Gas 2 Stan-dard

Optio-nal

O2 A B E, F G, H Steam +air, N2

C D B N2

P D B N2

NH3 C A C G Air

T C G Air

E E G Air

F E G Air

NH3 H2O D A 0 5 vol% 0 30 vol% 240 vol%*m 0.1 vol%*m 0.1 vol%*m 5 % C G Air

T 0 5 vol% 0 30 vol% 240 vol%*m 0.1 vol%*m 0.1 vol%*m 5 % C G Air

E 0 5 vol% 0 30 vol% 240 vol%*m 0.1 vol%*mAt 250 C

0.1 vol%*mAt 250 C

5 % E G Air

F 0 5 vol% 0 30 vol% 240 vol%*m 0.1 vol%*mAt 300 C"

0.1 vol%*mAt 300 C"

5 % E G Air

HCl E A C G Air

T C G Air

H E G Air

HCl H2O F A 0 5 vol% 0 30 vol% 360 vol%*m 0.1 vol%*m 0.1 vol%*m 5 % C G Air

T 0 5 vol% 0 30 vol% 360 vol%*m C G Air

H 0 5 vol% 0 30 vol% 360 vol%*m 0.1 vol%*mAt 150 C

0.1 vol%*mAt 150 C

5 % E G Air

Siemens AG 2013


18/48


19" central unit

2/18 Siemens PA 01 2013

1) At 20 C, 1 013 hPa2) If the smallest permissible process gas temperature of the application is Tmin> 20 C, the detection limit refers to Tminand standard pressure (1 013 hPa)3) At 0.3 m effective optical path length, average diameter of the dust particles: 15 m, specific weight of the dust particles: 650 kg/m3

4) At least: Detection limit5) Up to 200 C, 5 % above this6) Up to 60 vol% CO or up to 60 vol% CO2. Higher CO or CO2concentrations on request.



Dust load3):< 50 g/Nm3

Process gastemperature

Tmin Tmax


Min.measuringrange


Max. measuringrange

(also depen-dent on eff. opt.path length:see followingcolumn)

(Max. measur-ing range xpath length)

(DL x pathlength)under stan-dard con-ditions1) 2)

withoutcross-inter-

ference ofother gases

(DL x pathlength)At1 013 hPawith cross-interferenceof gas 2

Accu-racy4)

Gas1

Gas2

Gascode

Appl.code

Gas 1 Gas 1 Gas 1 Gas 1 Gas 1 Gas 1

HF G A 0 150 C 950 1 050 hPa 0 5 ppmv 0 1 500 ppmv 200 ppmv*m 0.1 ppmv*m 0.6 ppmv*mAt 15 vol%H2O, 55 C

5 %

H 150 250 C 950 1 050 hPa 0 5 ppmv 0 1 500 ppmv 200 ppmv*m 0.11 ppmv*mAt 150 C


5 %

HF H2O H A 0 150 C 950 1 050 hPa 0 5 ppmv 0 200 ppmv 200 ppmv*m 0.1 ppmv*m 0.6 ppmv*mAt 15 vol%H2O, 55 C

5 %

H 150 250 C 950 1 050 hPa 0 5 ppmv 0 200 ppmv 200 ppmv*m 0.11 ppmv*mAt 150 C

0.6 ppmv*mAt 15 vol%H

2

O, 150 C

5 %

CO J C 0 600 C 950 1 050 hPa 0 1.5 vol% 0 100 vol% 40 vol%*m 300 ppmv*m 1 500 ppmv*mat 50 vol%CO2, 20 C

2 %

CO CO2 K D 0 400 C 800 1 400 hPa 0 3.0 vol% 0 100 vol% 35 vol%*m 0.06 vol%*m 0.5 Vol%at 50 vol%CO2, 20 C

2 %6)

CO2 L A 0 150 C 950 1 050 hPa 0 7.5 vol% 0 100 vol% 40 vol%*m 300 ppmv*m 2 %

H2O M A 0 150 C 950 1 050 hPa 0 5 vol% 0 30 vol% 240 vol%*m 0.1 vol%*m 5 %

T 0 150 C 950 1 050 hPa 0 5 vol% 0 30 vol% 240 vol%*m 0.1 vol%*m 5 %

Siemens AG 2013


19/48


19" central unit


1) At 20 C, 1 013 hPa2) If the smallest permissible process gas temperature of the application is Tmin> 20 C, the detection limit refers to Tminand standard pressure (1 013 hPa)3) At 0.3 m optical path length, average diameter of the dust particles: 15 m, specific weight of the dust particles: 650 kg/m3

4)

At least: Detection limit5) Depends on temperature (higher values at higher temperatures)





Min. measuringrange

(with 1 m eff. opt.path length)

Max. mea-suring range

(usually alsodependent oneff. opt. pathlength: seefollowingcolumn)

(Max.measuringrange xpathlength)

(DL x pathlength)understandardconditions1)2)

(DL x pathlength)At 1 013 hPawith cross-interferenceof gas 1

Accu-racy4)

Purging gasmode

Purginggasmedium

Gas 1 Gas 2 Gascode

Appl.code

Gas 2 Gas 2 Gas 2 Gas 2 Gas 2 Gas 2 Stan-dard

Optio-nal

HF G A C G Air

H E G Air

HF H2O H A 0 5 vol% 0 30 vol% 360 vol%*m 0.1 vol%*m 0.1 vol%*m 5 % C G Air

H 0 5 vol% 0 30 vol% 360 vol%*m 300 ppmv*m

At 200 C

300 ppmv*m

At 200 C

5 % E G Air

CO J C E G Air, N2

CO CO2 K D 0 7.5 vol% 0 100 vol% 75 vol%*m 0.15 vol%*m 0.5 vol% at50 vol% CO,20C

2 5 %5) C G Air

CO2 L A C G Air

H2O M A C G Air

T C G Air

If the process conditions deviate from the specifications of the standard applications, special applications are alsopossible on request. Please complete the application questionnaire which can be found athttps://intranet.automation.siemens.com/w1/automation-technology-gas-analyzer-gas-analysis-19001.htm#lb-51,content-19362 on the Internet.

Siemens AG 2013


20/48


Cross-duct sensor CD 6

2/20 Siemens PA 01 2013

Overview

Cross-duct sensors CD 6 and cables for non-Ex applications

The standard cross-duct sensor consists of a transmitter unitand a detector unit with the same dimensions. The transmitterunit provides a connector for the fiber-optic cable. The laser light

is transmitted through this cable. The receiver unit contains aphotodetector and an electronics PCB, and is connected to thedetector unit by a sensor cable.

The sensors are mounted onto flanges. The easiest way to avoidcondensation and dust deposits on the sensor windows is to usea purging gas, e.g. with instrument air. Purging must be selecteddepending on the application. The cross-duct sensors cantherefore be configured for the respective situation. The applica-tion reference table provides recommendations for suitablepurging with standard applications.

If a component is to be measured which is also present in mea-surable quantities in the purging medium - such as oxygen ormoisture - it is necessary to use purging gases such as nitrogen,superheated process steam or similar. In such cases it is usuallyalso necessary to purge the sensor heads, since the ambient air

must also be displaced here out of the laser beam path. A differ-entiation is therefore made between purging on the process sideand purging on the sensor side.

Note: For measurement of O2at gas temperatures above600 C, it may also be possible to tolerate air as the purging me-dium since its influence on the measurement can be compen-sated. In contrast, the combination O2/temperature always re-quires O2-free purging.

Applications with oxygen (high-pressure)

For oxygen measurements with a higher process gas pressure(1 to 5 bar), the sensor CD 6 can be used together with a suitablewindow flange as the process connection. This window flange isalso available in the standard sizes DN 65/PN 6, DN 80/PN 16 orANSI 4"/150 lbs. The optical surface to the process is made ofborosilicate glass. Flanges can be equipped with window purg-

ing, but without purging tubes. Possible purge modes for thewindow flanges are "A-C" (no purging or moderate purging onthe process side). Window flanges are tested for leakage beforedelivery using overpressure, and show leakage rates of lessthan 10-5mbarl/s.

For ordering this application, the MLFB code of the central unitwith the application code "P" must be selected. The process in-terface suitable for the sensors can be chosen by selection ofthe corresponding code in the 6th configurable position of theMLFB number.

The most important sensor purging configurations are presentedbelow:

Purging on the process side with moderate flow

Is selected e.g. for pure gas applications, emission monitoring,inerting monitoring. The purging gas flow can be adjusted be-tween 0 and approx. 120 l/min at each sensor head using a nee-

dle valve (included in delivery).

Moderate purging on the process side

Purging on the process side with increased flowThrough omission of needle valve. This type of purging is se-lected in crude gas applications with higher concentrations ofparticles and/or condensation as well as in non-purified fluegases in combustion plants. The purging gas flow is typically setbetween 200 and 500 l/min on each sensor head depending onthe input pressure of the purging medium.

Increased purging on the process side

Purging on the process side with high flow

Through use of air blower or dry process steam. Connectors withhose adapters are included in the delivery. An additionalSwagelok adapter must be ordered if a high flow of steam or in-strument air purging is required (option A27). This type of purg-ing is selected in crude gas applications with very high concen-trations of particles and/or condensation such as in the furnacesof combustion plants. If instrument air is not available, an airblower is also an alternative for purging in applications withlower demands. On the process side, dry steam can be used as

the inert purging gas instead of nitrogen (Tmax. 240 C). Thepurging gas flow is automatically set between 500 and


21/48




Increased purging on the process side, with hose connection adapter

Purging on sensor side

Can be combined with any purging mode on the process side,and is always selected if the ambient air must never have an in-fluence on the measurement. The volumes within the sensorhead are then continuously purged with an O2-free gas. The flowof purging gas required in this case is approx. 1 to 6 l/min and isset using a needle valve (included in delivery). The combinationshown here of purging with superheated process steam on theprocess side and with nitrogen from a compressed gas bottle onthe sensor side may satisfy the necessity for O2-free purginge.g. also in combustion plants with boilers without own nitrogennetwork.

Note

With purging on the process side, it may be necessary to usenon-return valves to ensure no process gas can enter the purg-ing gas line in the event of failure of the purging gas supply. Thisapplies especially in the case of cascaded process and sensorpurging where there is otherwise the danger that, for example,corrosive process gases could enter the sensor enclosure.

Sensor configuration with high purging on the process side, with 6 mmjoint for use with steam, and with N2purging on the sensor side

The purging media used on the process side flow through purg-ing gas tubes into the process gas flow. The tubes extend a fewcentimeters into the process area, and usually provide a flowfrom the side. This results in a wedge being generated in the in-let zone of the purging gas. The effective measuring path in theprocess gas is therefore well-defined as the distance betweenthe ends of the two purging gas inlet tubes.

Cross-duct sensor CD 6: Options and accessories

Sensor alignment kit

Includes a battery-operated visible light source, a centering aidwith crosshair, and two hook spanners for opening the opticstube of the sensors.

Please note: the sensor alignment kit is not explosion protected.

Installation requirements for the cross-duct sensors CD 6

125 ... 375 mmtyp. 0 ... 25 mm

2 (maximum)

DN 65/PN 6

or ANSI 4"/150 lbs

Process wall

Process wall thickness

(incl. insulation)

Process flange

Siemens AG 2013


22/48



2/22 Siemens PA 01 2013

Purging air blower

Two purging air blowers are required to purge the sensor heads.Both 230 V AC and 115 V AC versions can be ordered.

Sensor configuration with purging air blower

Flow cell (available on special application)

For implementation of measuring configurations with bypassmode. The cell consists of a stainless steel tube whose internalsurfaces are coated with PTFE to minimize surface effects. With

an effective measuring path of 1 m, the inner volume is only 1.2 l,and fast gas displacement times can therefore be achieved. Theflow of sample gas can be from the ends or from the center ofthe tube, since appropriate 6 mm joints are present here. Theflow cell can be ordered in four configurations:

Unheated, including assembly for wall mounting

Unheated, including assembly for wall mounting and a 19"housing with an air jet pump with a delivery rate of max.30 l/min

As above, but can be heated up to approx. 200 C

As above, but can be heated up to approx 200 C andmounted on a rack with wheels and integrated 19" frame

Optical bandpass filter

Serves to protect the light-sensitive detector in the receiver unit

of the sensor from saturation by IR background radiation. Is usedwith measurements in very hot process gases (T > 1000 C) orwith unavoidable appearances of flames in the measurementpath.

12

Electrical connections:

230 V AC 50 Hz

or 115 V AC 60 Hz

1 hose connection

Air

filter

CD 6 sensor for

blower air purging

Siemens AG 2013


23/48




Technical specifications


Accessories

General information

Design Transmitter and detector units,connected by a sensor cable

Materials Stainless steel, aluminum

Installation Vertical or parallel to the gas flow

Laser protection class Class 1, safe to the eye

Explosion protection ATEX II 1 G Ex ia IIC T4 Ga andATEX II 1 D Ex ia IIIC T135C DaIP65

A defined leak rate can only beguaranteed when using high-pressure window flanges. Other-wise it may be necessary for theowner to carry out an evaluationin accordance with ATEXDEMKO 06 ATEX 139648X;DEMKO IECEx ULD 06 0011X.

Design, enclosure

Degree of protection IP65

Dimensions Diameter: 163, L: 395 mm

Purging gas tube in mm 400 (370 net) x 44 x 40

800 (770 net) x 44 x 40

1 200 (1 170 net) x 44 x 40

Weight 2 x approx. 11 kg

Mounting DN 65/PN 6 or ANSI 4"/150

Please note:

For purging tubes with a length of 800 and 1 200 mm, the wall thicknessmust not exceed 200 mm with DN 65/PN 6 connections. To carry outmeasurements with thicker walls, please contact Siemens.

The optimum adjustment of the flanges can change with highdifferences in temperature depending on the type of assembly.

Electrical characteristics

Power supply 24 V DC, supply from central unitvia hybrid cable

Power consumption < 2 W during operation

Climatic conditions

Ambient temperature

Non-Ex -20 ... +70 C during operation,

-30 ... +70 C during storage andtransportation

Ex -20 ... +60 C during operation,

-30 ... +70 C during storage andtransportation

Humidity < 95 % RH, above dew point

Pressure 800 ... 1 100 hPaTemperature range on the sensorside of the process interface (con-nection plate)

-20 +70 C

Measuring conditions

Measurement path 0.3 ... 12 m (other lengths onrequest)

Dust load The influence of dust is very com-plex and depends on the pathlength and particle size. The opti-cal attenuation increases expo-nentially at longer path lengths.Smaller particles also have alarge influence on the opticalattenuation. With high dust load,long path length and small parti-

cle size, the technical support atSiemens should be consulted.

Purging

Nitrogen is permissible as the purging gas for the sensor side. Nitrogen,steam, air and gases which are not subject to the pressure equipmentdirective Cat. 2 are permissible as purging gases for the process side.

Purging with instrument air, N2

Max. overpressure in the sensor < 500 hPa

Quality

- Instrument air Free of oil and water

- Nitrogen Purity better than 99.7 %. For oxy-gen measurements, an O2con-tent < 0.01 % in the purging gas(optical path length 1 m, min.5 % oxygen in the process gas)

Maximum flow rate(process purging)

500 l/min

Dew point Benchmark: < -10 C, condensa-tion on the optics must be

avoidedBlower purging

Maximum counter pressure 40 hPa

Maximum flow rate 850 l/min

Power consumption 370 W

Degree of protection (fan) IP54, cover required to protectagainst rain

Steam purging

Steam conditioning Overheated

Maximum temperature 240 C

Minimum pressure > 4 000 hPa

Maximum pressure 16 000 hPa, refers to a volumeflow of approx. 1 100 l/min

Siemens AG 2013


24/48



2/24 Siemens PA 01 2013

Hybrid and sensor cables

General information

Configuration hybrid cable Two optical f ibers and two twistedcopper wires in one cable for24 V DC. Single-mode opticalfiber configured at both ends with

E2000 angle connectors. Multi-mode optical fiber configured atboth ends with SMA connectors.

Cable is flame-retardant, verygood resistance to oil, gasoline,acids and alkalis, outer sheathUV-resistant

Cable sheath Oil-resistant polyurethane

Dimensions For > 500 m, an external powersupply must be additionally or-dered

For installation in hazardouszones, non-intrinsically-safe ca-bles have to be spatially sepa-rated from intrinsically-safe lines

Diameter < 8.5 mm

Length Use in non-hazardous andEx Zone 2: Up to 700 m

Use in Ex Zone 0 and Zone 1:Up to 250 m

Weight 75 kg/km

Maximum tensile force 200 N

Maximum lateral pressure 1 000 N/cm

Impact resistance 200 N/cm

Maximum tensile strength 500 N

Minimum bending radius 12 cm

Climatic conditions

Ambient temperature -40 ... +70 C during transport,storage and operation

-5 ... +50 C during layingHumidity < 95 % rel. humidity, above dew

point (in operation and storage)

Siemens AG 2013


25/48





LDS 6 in-situ gas analyzerPair of sensors (cross-duct sensor)

7MB6122- 77777 - 7777

Explosion protectionWithout 0ATEX II 1 G Ex ia IIC T4 Ga and ATEX II 1 D Ex ia IIIC T135C Da IP65 1

Sensor type Measured componentStandard cross-duct sensor O2 AAll gases except O2 W

Purging, process side Sensor sideWithout purging Without purging A

Air or N2, 1 to 2 l/min;incl. needle valve, 6 mm Swagelok

B

Instrument air or N2Reduced flow: 0 ... 120 l/minincl. needle valve, 6 mm Swagelok

Without purging C


D

Air or N2Increased flow: 200 ... 500 l/minincl. 6 mm Swagelok

Without purging E


F

Air, fan or steam;high flow: > 500 l/minincl. 1" hose adapter

Without purging G


H

Purging tubes, material

No purging tubes 0

Stainless steel, EN 1.4432/316L 1Purging tubes, length

No purging tubes 0

400 mm 1

800 mm 2

1 200 mm 3

75 mm, e.g. for engine test rigs 4

Process connection

Stainless steel flange (EN 1.4404/316L),connection dimension DN65/PN6, MAWP (PS) @ 20 C: 0.005 MPa

0

Stainless steel flange (EN 1.4404/316L),connection dimension ANSI 4"/150 lbs, MAWP (PS) @ 20 C: 7.25 psi

1

Stainless steel flange (EN 1.4404/316L),connection dimension DN65/PN6, MAWP (PS) @ 20 C: 0.005 MPa,incl. enclosed welding flanges, e.g. for engine test r igs

2

Pressure-resistant window flange (EN 1.4404/316L, borosilicate glass),connection dimension DN65/PN6, MAWP (PS) @ 20 C: 0.6 MPa

3

Pressure-resistant window flange (EN 1.4404/316L, borosilicate glass),connection dimension DN80/PN16, MAWP (PS) @ 20 C: 1.6 MPa

4

Pressure-resistant window flange (EN 1.4404/316L, borosilicate glass),connection dimension ANSI 4"/150 lbs, MAWP (PS) @ 20 C: 232 psi

5

Hybrid cable Length [m]

No hybrid cable X

Standard length 5 A

10 B25 E

40 G50 H

Customized length (specified in complete meters) Z

Siemens AG 2013


26/48



2/26 Siemens PA 01 2013

Sensor connecting cable Length [m]

No sensor connecting cable XStandard length 5 A

10 B25 E

Customer-specific length (specified in complete meters) ZLanguage (supplied documentation)

German 0

English 1

French 2

Spanish 3

Italian 4


LDS 6 in-situ gas analyzerPair of sensors (cross-duct sensor)

7MB6122- 77777 - 7777


Additional versions Order code

Add "-Z" to Order No. and specify order code

6 mm Swagelok adapter for purging with steam, purging modes G and H A27

Acceptance test certificate 3.1 (leak test) in accordance with EN 10204(only in combination with pressure-resistant window flanges) C12

Acceptance test certificate 3.1 (material certificate) in accordance with EN 10204(only in combination with pressure-resistant window flanges)

C13

Purging tube, special length M1Y

Hybrid cable, customized length P1Y

Sensor cable, customized length Q1Y

TAG label, customized inscription Y30

Additional units Order No.

Purging air blower 230 V A5E00829151

Purging air blower 115 V A5E00829150

CD 6, sensor alignment kit A5E00253142

Optical filter for reducing IR background radiation (flame filter) A5E00534668

Siemens AG 2013


27/48




Dimensional drawings

Cross-duct sensor CD 6, moderate purging (instrument air), version

according to Order No. 7MB6122-**C1*-0***, dimensions in mm

Cross-duct sensor CD 6, increased purging (instrument air), version

according to Order No. 7MB6122-**E1*-0***, dimensions in mm

370(770

,117

0)

395

105

400(800

,1200)

163

44.5 at 400 length

54 at 800, 1 200 length

Process flange

(provided by

customer)

6 mm fitting for

370(770

,1170)

400(800,1200)

395

105

163

44.5 at 400 length

54 at 800, 1 200 length

Process flange(provided by

customer)

Siemens AG 2013


28/48



2/28 Siemens PA 01 2013

Cross-duct sensor CD 6, blower purging, version according toOrder No. 7MB6122-**G1*-0***, dimensions in mm

Cross-duct sensor CD 6, sensor and process side purging, versionaccording to Order No. 7MB6122-**H1*-0***-Z A27, dimensions in mm

400(800

,1200)

370(770

,1170)

395

163

105

44.5 at 400 length

54 at 800, 1 200 length


customer)

1 hose (OD)

395

163

105

370(770

,1170)

400(800

,1200)

44.5 at 400 length

54 at 800, 1200 length

6 mm fitting

Test valve


customer)

Siemens AG 2013


29/48




Cross-duct sensor CD 6, purged version according toOrder No. 7MB6122-*WC14-2***, dimensions in mm

CD 6 high-pressure sensor for oxygen, dimensions in mm

431

163

105

High pressure flange

Check valve

Fitting

for 6 mm

OD hose

Siemens AG 2013


30/48


Documentation

2/30 Siemens PA 01 2013



More information

For demanding applications it is recommended to keep purgingtubes, window modules and detector electronics in stock (quan-tities stated per measuring point, i.e. per pair of sensors).

For the suitability of different parts (version 1 or version 2) pleaseconsult the instrument manual or contact Siemens directly. Ingeneral, all new analyzers are compatible with spare parts ofversion 2.

Manual Order No.

LDS 6 manual

German A5E00295893

English A5E00295894 French A5E00295895

Italian A5E00295896

Spanish A5E00362720

Suggestions for spare parts

Description Quantity for2 years

Quantity for5 years

Order No.

CD 6, window module, quartz 1 2 A5E00338487

CD 6, window module, engine test rig, no purging 1 2 A5E00338490

CD 6, high-pressure window flange (EN 1.4404/316L), DN 65/PN 6 1 2 A5E00534662

CD 6, high-pressure window flange (EN 1.4404/316L), DN 80/PN 16 1 2 A5E00534663

CD 6, high-pressure window flange (EN 1.4404/316L), ANSI 4"/150 lbs 1 2 A5E00534664

Gasket for CD 6 hybrid cable 1 2 A5E00853911

CD 6, sensor electronics FO InGaAs (version 2) 1 1 A5E01090409

CD 6, sensor electronics FO Ge, only HCl (version 2) 1 1 A5E01090413

CD 6, sensor electronics SW, only O2 1 1 A5E00338533

CD 6, sensor electronics ATEX SW, only O2 1 1 A5E00338563

CD 6, sensor electronics ATEX HCI 1 1 A5E00853896

CD 6, sensor electronics ATEX NH3

, CO, CO2

, HF, H2

O, low gain 1 1 A5E00338572

CD 6, purging tube 400 mm 1.4432/316L 1 2 A5E00253111



Siemens AG 2013


31/48

Continuous Gas Analyzers, in-situSITRANS SL

In-situ O2 and CO gas analyzer


Overview

SITRANS SL is a diode laser gas analyzer with a measuring prin-ciple based on the specific light absorption of different gas com-ponents. SITRANS SL is suitable for fast, non-contact measure-ment of gas concentrations in process or flue gases. An analyzer

consisting of transmitter and receiver units (sensors) is used foreach measuring point. The hardware for further processing ofthe measured signal into a concentration value, as well as themonitoring, control and communication functions, are integratedin these two main modules. The sensors are designed for oper-ation under harsh environmental conditions.

SITRANS SL

Benefits

The in-situ SITRANS SL gas analyzer features high operationalavailability, unique analytical selectivity, and a wide range ofpossible applications. SITRANS SL permits measurement of agas component directly in the process:

With high dust load In hot, humid, corrosive, explosive, or toxic gases

In applications showing strong varying gas compositions

Under harsh environmental conditions at the measuring point

Highly selective, i.e. mostly without cross-sensitivities

Special features of the SITRANS SL:

Little installation effort

Minimum maintenance requirements

Extremely rugged design

High long-term stability through built-in, maintenance-freereference gas cell

Real-time measurements

Moreover, the analyzer provides warning and error messages:

When maintenance is required- With large variations in the reference signal- With poor signal quality

If the transmission violates an upper or lower limit

Siemens AG 2013


32/48



2/32 Siemens PA 01 2013

Application

Applications

Control of combustion processes

Process optimization

Plant and operator safety Process measurements in all types of power and combustionplants

Process control

Explosion protection

Measurements in corrosive and toxic gases

Quality control

Sectors

Chemical and petrochemical plants

Power plants

Waste incinerators Iron and steel industry

The following table lists the measuring conditions for standardapplications. The listed values for the measuring range and de-tection limit are only approximate values. The exact values at therespective measuring point depend on the totality of all influenc-ing variables and can be determined by Siemens for the specificcase. Please note that the values for the detection limit and themaximum measuring range refer to a path length of 1 m. Longerpath lengths will improve the detection limit, but not linearly. dueto limiting effects such as dust load. The maximum applicablemeasuring ranges can only be used if permitted by the processconditions such as dust load.

Reference table: Standard applications. The specified pressures are absolute.

DL = detection limit1) At 20 C, 1 013 hPa, without dust2) With 0.3 m effective optical path length

Average diameter of the dust particles: 15 mSpecific weight of the dust particles: 650 kg/m3

The influence of dust load is extremely complex, and depends on the path length and particle size. The optical attenuation increases exponentially at longerpath lengths. Smaller particles also have a very large influence on the optical attenuation. With high dust load, long path length and small particle size, thetechnical support at Siemens should be consulted.

3) Referred to measuring range.With stable or externally measured and software-compensated process gas temperature and pressure conditions.


Standard applicationEffective optical pathlength: 0.3 8 m


Process gastemperatureTmin Tmax


Min.measuringrange


Max.measuringrange

(also dependenton eff. opt. pathlength: see fol-lowing column)

Max.measuringrange x path

length

DL x pathlength(under

standardconditions1)

withoutcross-inter-ference ofother gases)

Repeata-bility3)

Purginggasmedium

Samplegas com-ponent

Gascode

Appl.code

O2 A B 0 600 C 900 1 100hPa

0 1 vol% 0 100 vol% 75 vol%*m 200 ppmv*m 2 % N2

O2 A C 0 200 C 700 5 000hPa

0 1 vol% 0 100 vol% 75 vol%*m 200 ppmv*m 2 % N2

CO J C -20 700 C 700 ...2 000 hPa,max. 300 C

800 ...1 200 hPa,above 300 C

0 100 ppmv 0 6 000 ppmv 2 000 ppmv*m 0.6 ppmv*m 2 % Air, N2

In addition to the standard applications, special applications are available upon request. If the process conditionsdeviate from the specifications of the standard applications, special applications are also possible on request.Please complete the application questionnaire which can be found athttps://intranet.automation.siemens.com/w1/automation-technology-gas-analyzer-gas-analysis-19001.htm#lb-51,content-19362 on the Internet.

Siemens AG 2013


33/48




Design

The SITRANS SL gas analyzer consists of a pair of cross-ductsensors, a transmitter unit and a detector unit, both with thesame dimensions. The complete analyzer is integrated in thesetwo enclosures. The transmitter unit contains the laser source

whose light is transmitted to the receiver through the measure-ment path. The detector unit contains a photodetector includingelectronics as well as a reference cell. The detector unit is con-nected to the transmitter unit by means of a sensor cable. A fur-ther cable on the receiver is used to connect the power supplyand the communication interfaces. The receiver enclosure con-tains a local user interface (LUI) with an LC display which can beread through a window in the cover. The LUI is operated by re-mote-control.

Transmitter and detector units

Special features of the transmitter and detector units:

In-situ cross-duct sensors, designed as transmitter and detec-tor units, connected via sensor cable

Powder-coated aluminium; stainless steel

Degree of protection IP65

Adjustable process connection plates

Flange sizes (provided by customer): DN50/PN25,ANSI 4/150 lbs

Purging gas connections (see "Purging")

Optional: Explosion-protected version in accordance with- ATEX II 2G Ex de op is IIC T6

ATEX II 2D Ex tD A21 IP65 T85C

SITRANS SL, detector unit

Parts in contact with the process gas

Only the stainless steel and borosilicate window flange of thesensor is wetted by the process gas. This has optional connec-tions for purging the process gas side with an appropriate gas-eous medium.

Display and control panel

Special features of the detector unit:

Display for simultaneous output of result and device status

LED backlighting of display

Remote operation using membrane keypad and softkeyswhich are easy to clean

Menu-driven operation for parameterization and diagnostics

Remote operation via infrared interface for safe use in hazard-ous zones

Local user interface (LUI) of SITRANS SL in the detector unit(display of measured value)

Remote control keypad for SITRANS SL

Connection cables

SITRANS SL is supplied as standard without connecting cables.These must be provided by the customer or are available as ac-cessories. Exception: the ATEX version is supplied as standardwith cabling.

The sensor cable connects together the transmitter and detectorunits of the analyzer.

The sensor connecting cable available as a cable set for theATEX version as standard, and for non-Ex applications option-ally, is offered in lengths of 5, 10 or 25 m. This (optional) cableset also enables permanent installation of an Ethernet cableused for service and maintenance purposes.

A rugged cable sleeve should be used as UV protection for in-stallations in open cable ducts or channel systems.

The statutory directives must be observed in the event of instal-lation in hazardous areas.

For the ATEX version of SITRANS SL, the sensor connecting ca-ble must be connected between the two Ex-e terminal boxes se-cured on the transmitter and receiver units.

Siemens AG 2013


34/48



2/34 Siemens PA 01 2013

Inputs/outputs

2 analog inputs (4 to 20 mA) for process gas temperature andpressure

2 analog outputs (4 to 20 mA) for gas concentration or for con-centration and transmission

1 configurable binary input

2 configurable binary outputs (display of faults, maintenancerequirement, function monitoring, alarms for limit violations ofmeasured value or transmission)

Optional: 1 PROFIBUS DP interface with:- Output of concentration as cyclic data- Alarm output, alarm classification- Input for temperature and/or pressure data for compensation

The PROFIBUS DP protocol provides DPV0, cyclic data. Mea-sured values are provided with additional quality data.

Optional

1 Modbus interface with- Output of concentration as cyclic data- Alarm output, alarm classification- Input for temperature and/or pressure data for compensation

1 Ethernet 10Base-TX port, only for servicing and mainte-

nanceNote:

In contrast to the other interfaces, the Ethernet plug-in connectoron standard non-Ex devices is only accessible following removalof the detector unit cover. With the help of the sensor connectioncable set (optional with non-Ex devices), an Ethernet cable canbe permanently installed via the terminal box of the sensor con-necting cable. The Ethernet connection via the sensor connect-ing cable can also only be used for temporary service and main-tenance purposes.

NOTICE:

In an Ex environment, Ethernet connections may only be madeor removed with the permission of the plant operator!

Function

Operating principle

SITRANS SL is a gas analyzer employing single-line molecularabsorption spectroscopy. A diode laser emits a beam of infraredlight which passes through the process gas and is received bya detector unit. The wavelength of the laser diode output is tunedto a gas-specific absorption line. The laser continuously scans

this single absorption line with a very high spectral resolution.The degree of absorption and the line shape are used for theevaluation. The measurement is free of cross-interferences,since the quasi-monochromatic laser light is absorbed very se-lectively by only one specific line in the scanned spectral range.

Basic design of the SITRANS SL

Reference

cell

OpticsDetector

Optics

Reference cellElectric filter

Computer for control and evaluation

Customer

interface

Local

display

Measurement

Alarms

External sensors

for compensation

Electric interface

Optics tube (receiver)

Receiver

Electricinterface

Optics

Transmitter

Optics tube (transmitter)

LaserOptics

Laser electronics

Electric interface

Sensor head (transmitter) Sensor head (receiver)

Laser control

Measured

volume

Siemens AG 2013


35/48




The field design of the SITRANS SL in-situ gas analyzer consistsof a transmitter unit and a detector unit. The light which is not ab-sorbed by the sample is detected in the receiver. The concentra-tion of the gas component is determined from the absorption.

The SITRANS SL analyzer measures a single gas component bymeans of the absorption capacity of a single fully resolved mo-

lecular absorption line.

Absorption spectrum of measured signal and reference signal withSITRANS SL

SITRANS SL is designed for measuring oxygen (O2) and carbonmonoxide (CO) at high sensitivity.

Typical application specifications:

The measuring performance of the SITRANS SL depends,among others, on the actual, individual process conditions withregard to concentration ranges, pressure and temperature.

An internal reference cell is used to constantly check the stabilityof the spectrometer.

The self-calibration of the analyzer is therefore valid for at leastone year without the necessity for external recalibration usingcalibration gases.

Typical spectral bandwidth of an absorption line compared to the band-width of the laser light.

Configuration

A feature of the in-situ analytical procedure is that the physicalmeasurement takes place directly in the stream of process gasand directly in the actual process gas l ine. All process parame-ters such as gas matrix, pressure, temperature, moisture, dustload, flow velocity and mounting orientation can influence the

measuring properties of the SITRANS SL and must therefore beinvestigated for each new application.

The standard applications listed in the order ing data for theSITRANS SL are distinguished in that the typical process condi-tions are adequately well-known and documented. If you cannotfind your application among the standard applications, pleasecontact Siemens. We will be pleased to check your possible in-dividual application of the SITRANS SL. You can find an applica-tion questionnaire on the SITRANS SL product site on the Inter-net.

Typical cross-duct arrangement of the SITRANS SL

The SITRANS SL can be optionally purged on the process sideusing appropriate purging gases to prevent contamination of thesensor optics on the process side. Purging tubes on the sensorheads, which slightly extend into the process gas stream, definethe effective measuring path length.

Oxygen concentration 0 ... 21 vol %

Process pressure/temperature con-ditions (with O2application)

700 ... 5 000 hPa(absolute)/0 ... 200 C

900 ... 1 100 hPa(absolute)/0 ... 600 C

Carbon monoxide concentration Smallest measuring range:0 100 ppm @ 1m

Largest measuring range:0 6 000 ppm @ 30 cm

Process gas pressure/temperatureconditions with CO application

700 2 000 hPa (absolute) /-20 300 C

800 1 200 hPa (absolute) /-20 700 C

Wavelength [nm]

Absorption

Transmitter unit Receiver

Process flange

- Dimensions

- Temperature

Sensor cable

Measuring

path length

Purging tube length

Gas concentration

Flue gas

composition

Steam

Dust load

Gas velocityGas temperature

Gas pressure

Purg

in

gon

theprocesss

ide

Purgingon

thesensors

ide

Siemens AG 2013


36/48



2/36 Siemens PA 01 2013

Influences on the measurement

Dust load

As long as the laser beam is able to generate a suitable detectorsignal, the dust load in the process gas does not influence theanalytical result. By applying a dynamic background correction,measurements can be carried out without any negative impact.Under optimal conditions, the SITRANS SL can cope with dustloads up to 20 g/Nm and up to a measured path length of 8 m.The influence of a high dust load is extremely complex, and de-pends on the optical path length and particle size. The opticaldamping increases exponentially at longer path lengths. Smallerparticles also have a very large influence on the optical damp-ing. With high dust load, long path length and small particle size,the technical support at Siemens should be consulted.

Temperature

The influence of temperature on the absorption line is compen-sated by a correction file. A temperature signal can be fed intothe instrument from an external temperature sensor. The signalis then used for mathematical correction of the influence of thetemperature on the observed line strength. If the process gastemperature remains constant, a static correction can be carried

out as an alternative. Without temperature compensation, the rel-ative error caused by changes in the gas temperature has an ex-tensive effect on the measurement (e.g. up to 0.24 %/K with theO2application). An external temperature signal is therefore rec-ommended in most cases.

Pressure

The process gas pressure can affect the line shape of the mo-lecular absorption line. For known pressure values, theSITRANS SL uses a special algorithm to adapt the line shape.Additionally, an external pressure signal can be fed to the instru-ment to provide complete mathematical compensation for thepressure influence including the density effect. Without compen-sation, the relative error caused by changes in the process gaspressure is approx. 0.1 %/hPa. An external pressure signal istherefore recommended in most cases.

Interferences

Since the SITRANS SL derives its signal from a single fully re-solved molecular absorption line, inter ferences from other gasesare quite unlikely. The SITRANS SL is therefore able to measurethe desired gas components very selectively. In special cases,the composition of the process gas might have an influence on

the shape of the absorption lines. This influence is compensatedby analyzing the full shape of the detected signal curve applyingspecific algorithms.

Effective optical path length

As a result of Beer-Lamberts law, the absorption of laser light de-pends on the optical path length within the sample gas. There-fore the precision of the effective optical path length measure-ment can have an effect on the precision of the totalmeasurement.

Since the sensor optics on the process side usually has to bepurged to keep it clean for a longer period, the extent of themixed zone between the purging medium and the process gasas well as the latters concentration distribution must be consid-ered. In a typical in-situ installation with an optical path length ofseveral meters, the influence of the purging gas on the effective

path length can be ignored.The path length and dust load are mutually influencing: thehigher the dust load in the process, the shorter the max. possiblepath length.

Design of the non-Ex version of the SITRANS SL system

Receiver unit

Purging tube

(optional)

Customer flange

Flange connection plate

(process interface)

Transmitter unit

Cable gland

Cable glandSensor connecting cable

(optional)

Sensor connectingcable (optional)

Reference cell integrated

into receiver unit

Connecting

cable (optional)

Siemens AG 2013


37/48




Design of the ATEX version of the SITRANS SL system

Design of the FM version of the SITRANS SL system

The transmitter and d

chloride analyser

Documents